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45 lines
1.2 KiB
JavaScript
45 lines
1.2 KiB
JavaScript
"use strict";
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const chalk = require("chalk");
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const util = require("util");
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const INDENT = chalk.gray("│") + " ";
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function formatProperties(node) {
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let relevantProperties = Object.keys(node)
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.filter((property) => property !== "type" && typeof node[property] !== "object");
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return relevantProperties
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.map((property) => `${chalk.yellow.bold(property)}: ${util.inspect(node[property], { colors: true })}`)
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.join(" ");
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}
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function printNode(node, level) {
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if (node != null) {
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console.log(INDENT.repeat(level) + chalk.bold(node.type ?? "") + " " + formatProperties(node));
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for (let [ key, value ] of Object.entries(node)) {
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if (typeof value === "object" && value != null) {
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let isArray = Array.isArray(value);
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console.log(INDENT.repeat(level + 1) + chalk.cyan(key) + ":" + (isArray ? chalk.gray(" []") : ""));
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if (isArray) {
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value.forEach((item) => printNode(item, level + 1));
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} else {
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printNode(value, level + 1);
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}
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}
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}
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} else {
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// This should never happen!
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console.log(INDENT.repeat(level) + chalk.bold.red(`! ${node}`));
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}
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}
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// TODO: Add a non-printing renderAST method, for embedding in existing console.* calls
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module.exports = function printAST(ast) {
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return printNode(ast, 0);
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};
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